The series ends as Lupo and Bernard try to locate a blogger who threatened to blow up a school, but the teachers' union hampers the probe. Van Buren's personal issues become a public affair. Olympic star Lindsey Vonn appears as a union employee.

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The death of a young socialite points Lupo and Bernard toward the victim's cousin, and the ensuing investigation exposes a hefty inheritance, a secret romance, a fraudulent adoption and an unborn child.

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A model's body is set ablaze in an alley, kicking off an investigation that forces Lupo and Bernard to retrace the steps of two party crashers who made an appearance at a political event. Meanwhile, Lt. Van Buren faces health-care woes.

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A global-warming symposium becomes a crime scene after a scientist is poisoned and collapses during a speech. Detectives Lupo and Bernard initially suspect rivals from his field of study, but a messy custody battle points the investigation toward the victim's family. Tammy Blanchard, Tony Hale.

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A man shoots four police officers to death, and the investigation reveals a protective mother and evidence that the victims may have known the shooter. When an arrest is made, the ensuing trial pits cops and detectives against the prosecutors.

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Cutter takes on his mentor, Emily Ryan (Amy Madigan), when she tries to overturn the conviction of a man found guilty of a hate crime, and a secret from Cutter's past may affect the trial's outcome. Lisa Klein: Anna Chlumsky.

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A young woman's body is found in a hotel food-service cart, and the murder investigation turns up superficial evidence implicating a medical student who may be using a research project as a ruse to commit crimes. Ray Backlund: Timothy Busfield.

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Detectives Lupo and Bernard probe the murder of a high-school student whose body was burned in a parking lot, and the investigation uncovers a shocking cell-phone video, a shady educator and phony alibis. Moses: Aaron Shaw.

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The slaying of a witness in a murder trial kicks off an investigation that exposes a conspiracy rife with affairs, black-market dealings and drug cartels, and creates a predicament for ADA Connie Rubirosa and the remaining witnesses.

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A fatal drunken-driving accident may be more than what it seems when a suspicious nasal spray is found at the scene. In the course of the investigation, Detectives Lupo and Bernard turn their attention toward the victim's boss (Rich Sommer).

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A doctor who performed late-term abortions is found slain at a church, and the man's wife accuses a pro-life protester of the murder. Meanwhile, Lt. Van Buren receives troubling news, and Connie deals with a moral crisis.

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The death of a mother of 10 adopted, disabled kids kicks off an investigation that exposes an affair and a bid for reality-show stardom, which caused tension in the household. Larry Johnson: Jim Gaffigan.

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In the 20th-season opener, a war veteran's body is found in a university parking garage, and the subsequent murder investigation leads Lupo and Bernard to a law professor (David Alan Basche) who once worked for the Department of Justice. Greg Tanner: Creighton James.